Corning Incorporated
MX ˙ BMV ˙ US2193501051
SecurityMX:GLW / Corning Incorporated
InstitutionGrandfield & Dodd, Llc
Latest Disclosed Ownership65,964 shares
Latest Disclosed Value $ 8,969,125
Grandfield & Dodd, Llc reports 5.16% decrease in ownership of GLW / Corning Incorporated

On May 7, 2026 - Grandfield & Dodd, Llc filed a 13F-HR form disclosing ownership of 65,964 shares of Corning Incorporated (MX:GLW) valued at $8,969,125 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 69,554 shares of Corning Incorporated. This represents a change in shares of -5.16% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-07 2026-03-31 13F CORNING COM 219350105 65,964 -3,590 -5.16 8,969 47.27 0.5064
2026-02-10 2025-12-31 13F CORNING COM 219350105 69,554 -13,920 -16.68 6,090 -11.06 0.3449
2025-10-30 2025-09-30 13F CORNING COM 219350105 83,474 -36,291 -30.30 6,847 8.72 0.3884
2025-08-08 2025-06-30 13F CORNING COM 219350105 119,765 -48,379 -28.77 6,298 -18.18 0.3688
2025-05-02 2025-03-31 13F CORNING COM 219350105 168,144 -114,973 -40.61 7,698 -42.79 0.4773
2025-02-06 2024-12-31 13F CORNING COM 219350105 283,117 -57,332 -16.84 13,454 -12.48 0.8295
2024-11-08 2024-09-30 13F CORNING COM 219350105 340,449 -10,174 -2.90 15,371 12.85 0.9109
2024-08-09 2024-06-30 13F CORNING COM 219350105 350,623 -17,968 -4.87 13,622 12.13 0.8624
2024-05-06 2024-03-31 13F CORNING COM 219350105 368,591 -5,009 -1.34 12,149 6.79 0.7666
2024-01-31 2023-12-31 13F CORNING COM 219350105 373,600 6,468 1.76 11,376 1.70 0.7861
2023-10-26 2023-09-30 13F CORNING COM 219350105 367,132 2,682 0.74 11,187 -12.40 0.8219
2023-08-08 2023-06-30 13F CORNING COM 219350105 364,450 -340 -0.09 12,770 -0.77 0.8927
2023-04-28 2023-03-31 13F CORNING COM 219350105 364,790 1,072 0.29 12,870 10.78 0.8995
2023-01-20 2022-12-31 13F CORNING COM 219350105 363,718 -785 -0.22 11,617 9.80 0.8500
2022-11-04 2022-09-30 13F CORNING COM 219350105 364,503 2,117 0.58 10,580 -7.36 0.8638
2022-08-01 2022-06-30 13F CORNING COM 219350105 362,386 1,582 0.44 11,420 -14.26 0.8995
2022-04-19 2022-03-31 13F CORNING COM 219350105 360,804 -565 -0.16 13,320 -0.97 0.9039
2022-02-08 2021-12-31 13F CORNING COM 219350105 361,369 12,886 3.70 13,450 5.74 0.8652
2021-10-28 2021-09-30 13F CORNING COM 219350105 348,483 8,322 2.45 12,720 -8.55 0.8879
2021-07-28 2021-06-30 13F CORNING COM 219350105 340,161 2,724 0.81 13,910 -5.25 0.9626
2021-04-22 2021-03-31 13F CORNING COM 219350105 337,437 -3,180 -0.93 14,680 19.74 1.0975
2021-01-29 2020-12-31 13F CORNING COM 219350105 340,617 -1,740 -0.51 12,260 10.45 0.9620
2020-11-03 2020-09-30 13F CORNING COM 219350105 342,357 2,821 0.83 11,100 26.28 0.9998
2020-07-24 2020-06-30 13F CORNING COM 219350105 339,536 878 0.26 8,790 26.37 0.8505
2020-05-14 2020-03-31 13F CORNING COM 219350105 338,658 -2,832 -0.83 6,956 -30.03 0.8202
2020-02-07 2019-12-31 13F CORNING COM 219350105 341,490 9,268 2.79 9,941 4.92 0.9056
2019-10-30 2019-09-30 13F CORNING COM 219350105 332,222 4,537 1.38 9,475 -12.99 0.9323
2019-07-29 2019-06-30 13F CORNING COM 219350105 327,685 55 0.02 10,889 0.41 1.0763
2019-04-26 2019-03-31 13F CORNING COM 219350105 327,630 375 0.11 10,845 9.70 1.1294
2019-02-12 2018-12-31 13F CORNING COM 219350105 327,255 -5,226 -1.57 9,886 -15.77 1.1700
2018-11-02 2018-09-30 13F CORNING COM 219350105 332,481 -5,710 -1.69 11,737 26.15 1.2095
2018-07-27 2018-06-30 13F CORNING COM 219350105 338,191 300 0.09 9,304 -1.23 1.0222
2018-05-04 2018-03-31 13F/A-1 CORNING COM 219350105 337,891 -7,725 -2.24 9,420 -14.80 1.0508
2018-05-04 2018-03-31 13F CORNING COM 219350105 337,891 -7,725 9,420
2018-02-05 2017-12-31 13F CORNING COM 219350105 345,616 -3,636 -1.04 11,056 5.80 1.1802
2017-11-03 2017-09-30 13F CORNING COM 219350105 349,252 -5,965 -1.68 10,450 -2.10 1.1732
2017-07-27 2017-06-30 13F CORNING COM 219350105 355,217 -7,770 -2.14 10,674 8.91 1.2613
2017-04-28 2017-03-31 13F CORNING COM 219350105 362,987 1,563 0.43 9,801 11.73 1.2105
2017-02-02 2016-12-31 13F CORNING COM 219350105 361,424 12,257 3.51 8,772 6.22 1.1369
2016-10-24 2016-09-30 13F CORNING COM 219350105 349,167 2,015 0.58 8,258 16.15 1.0849
2016-07-28 2016-06-30 13F CORNING COM 219350105 347,152 5,599 1.64 7,110 -0.35 0.9953
2016-05-06 2016-03-31 13F CORNING COM 219350105 341,553 23,512 7.39 7,135 22.72 1.0326
2016-02-03 2015-12-31 13F CORNING COM 219350105 318,041 10,752 3.50 5,814 10.51 0.8838
2015-11-02 2015-09-30 13F CORNING COM 219350105 307,289 26,975 9.62 5,261 -4.88 0.8823
2015-08-03 2015-06-30 13F CORNING COM 219350105 280,314 25,239 9.89 5,531 -4.39 0.8461
2015-05-15 2015-03-31 13F CORNING COM 219350105 255,075 29,210 12.93 5,785 11.70 0.8844
2015-02-05 2014-12-31 13F CORNING COM 219350105 225,865 183,725 435.99 5,179 535.46 0.8005
2014-11-10 2014-09-30 13F CORNING COM 219350105 42,140 42,140 815 0.1281
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.